Grabbed 2 of these today while at the Kentucky warehouse to pick up my Acerbis tank for my XR650L. They held very firm even though the tank was an awkward shape and I got up to highway speeds. The little white caps on the end of the hooks come off easily and leaves a sharp tip. Otherwise I can't complain.
Elastic chord configured into a net with 3 rubberized metal hooks on opposing sides. It's cheap, simple, and it works (assuming you have attachment points on your bike.)
The hooks are rubber but due to the nature of the item, it will scuff metal, paint, and plastic.
I use this net to secure a small gym duffel onto my XT250 to and from work and to the gym. The net stretches pretty well in all directions so it doesn't matter if my bag is completely empty or totally full, it still holds securely.
I've dropped my bike a couple times with my bag secured with the net, no drama. Even if you forget to clip 2 or 3 of the hooks onto your bike (like I have) there's still a good chance the remaining hooks will take the load.
Probably the worst thing about this product is the hooks tend to tangle themselves in the netting when you take it off the bike. But, small price to pay for the functionality and practicality of always having a way to secure things to your bike.
As with other nets, the end caps come off very easily. I use this on my Wolfman Enduro Bags to hold an extra water bladder on top of the seat. Works great. If attaching to loops on bags/etc you can put the net on "upside down" with the open end of the hooks up. Will prevent the hooks from digging into your nylon bags, plastics, etc.
I bought a net to keep the back pack off me - hate wearing it. It works great to hold pack down to the pillion seat.I recommend gluing the white caps down before use so you don't lose them and scratch the fairings.